Doorlock



S. LARSON March 4 1924.,

DooRLocK Filed Mach 251. 1.922 l muuuummllmlllllllllllllll lllllllllllllllll Patented Mar. 4, 1924.

SHURE LAR/SON, F NORWAY, IOWA.

' DooRLooK.

Application filed March 23, 1922.

T0 all whom t may concern:

Be it known that I, SHURE LAnsoN, a citizen of the United States, residing atNorway, in the county of Benton and State of E Iowa, have invented certain new and useful Improvements in Doorlocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to produce a door-lock which permits the use of handles and thumb-pieces on both sides of a door, or

of a handle and thumb-piece on one side and a knob or hasp-latch on the other side, and which operates to latch by gravity, without the use of a spring.

The invention is fully disclosed in the description and claims following, reference being had to the accompanying drawing, 1n which Fig. 1 is a side elevation, partly in section, showing the parts in the door mortise, the

door and amb being in section. Fig. 2 is a similar View, but with a knob at one side of the door. Fig. 3 is a view in perspective of the latch used in a mortised door. Fig. Il

shows the reversible catch for the same.

In the drawing, the numeral 5 denotes a door, and 6 the door-jamb, which are of the usual construction. The jamb is provided with a suitable catch-plate 7 to receive the inclined catch 8, which is secured reversibly, as by a nut 9, to the depending arm 10 of the latch. At right angles to this arm extends a heavy arm 11, and from the angle a short ange 12 extends upwardly, and is pierced to receive a screw 13, one of a pair by which the guide and face plate V14 is secured to the edge of the door. This plate is pierced near the lower end by a square vhole 16,

which serves as a guide for the catch. The whole latch is contained in a mortise 17 of irregular outline, and deep enough to afford a limited play to the latch. The screw 13 serves as a pivot, and by the lift of the heavy arm 11 the latch is released from the catchplate. It re-engages therewith by gravity, as will be evident, and without the need of any spring. The action of the latch is thus made uniform and reliable, and not dependent upon a part which is liable to break or lose its resiliency.

Provision is made for lifting the gravity Serial No. 545,986.

arm of the latch by either a thumb-piece or a knob. In some cases it is desirable to use both, as for example on an outer door, where the handle 18 and thumb-piece 19b may be preferred for the outside, and a knob 2O for the inside. The handle and thumb-piece are of such simple construction as to need no description, the latter projecting under the arm 11 through a hole in the door. l

To allow for the use of a knob on one side, its shank 22 is provided with a double lever 23, which is recessed at 23a to. give room above it for the tails of the thumbpieces. Side wings 23b prevent displacement of the gravity arm when raised independently; The usual escutcheon-plate 24 serves as a bearing for the knob-shank at one side of the door. At the other end of the shank is a washer 25 held in place by a cross-pin 26, and resting in a counterbored hole 27 in this side of the door.

The door is supposed to be key-locked by va supplemental lock to engage the latch, but

not herein shown, as forming no essential part of this invention.

The device has the practical advantage of requiring much less cutting away of the door in mortising than is required in setting the ordinary mortise lock. This not only means less labor in forming the mortise, but leaves the door considerably stronger, as the mor tise is usually made in line with one of the cross-bars of the door, and cuts away a large part of its tenon. Still another advantage is found in the latitude it affords in locating the handles or knob. In the case of the ordinary mortise lock these must register exactly with a certain part of the lock. No such precision is required in the case of this lock, but the handle or knob may be set comparatively close to the jamb, if desired, or so far therefrom as to prevent any possibility of scraping knuckles thereon, regardless of the character of the jamb.

Having thus described my invention, I claim:

1.'In a door-lock, a latch having a heavy, laterally extending arm, a depending arm near the edge of the door, a catch therefor, a face-plate mortised for said catch, and an upwardly extending flange near the angle of the body of the latch, pierced for a screw, whereby the upper face-plate screw serves as a pivot for the latch.

2. In a door-lock, a latch having a substantially right-angled body, upwardly flanged near its angle, 'for a pivot-screw, a square-shanked catch secured to the depending arm of the latch near the lower end in a similar niortise, and a 'face-plate inortised for said catch, the upper fastening screw for the face-plate serving as the latch-pivot,

3. In a door-lock, a latch having an inwardly extending gravity arm and a depending catch-arm, a supportingpivot near the angle formed by said arms, a lift-lever disposed under the horizontal arin, and provided with lateral guide-wings, and a turnable shank engaging said lever.

4. In a door-lock, a latch having an inwardly extending gravity arm to control the catch, a pivot therefor near the edge of the door, and a double lever disposed under said arm, provided with a recess between the lever shank and the arm to receive the end of a thumb-lever, and la turnable shank to rock the double lever, whereby the lock is adapted for a knob on one side and a thumblever on the other.

In testimony whereof I ax iny signature 25 

